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| Authored by: Anonymous on Saturday, March 30 2013 @ 06:48 PM EDT |
Dunno abt 80486SX but Moto did a 68040 and crippled 68LC040.
Models of the Macintosh Quadra family with a crippled chip
gained fpu function only via a 3rd party PCI card with the extra chip
graphics, nic, HD accelerator, etc.
[ Reply to This | Parent | # ]
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| Authored by: Anonymous on Monday, April 01 2013 @ 03:00 AM EDT |
Somewhere above, i've posted a more complete timeline.
To answer your question: basically no, the 80487SX is *not* a
FPU without a CPU.
The 80487SX is a very slightly modified 80486DX, but:
- more expensive than the original 80486DX: Intel felt that
because it's a FPU, it can sell it at higher price than a
CPU..
- A 80486SX/80487SX combi takes more motherboard space than a
80486DX
- In board with a combi of 80486SX and 80487SX, the 80486SX
is effectively disabled, and the 80487SX does 'the work', the
80486SX sleeps.
The 80487SX is more or less a scam ;-)
In the olden days, the C't (German) magazine had an article
describing how a 80486SX/80487SX motherboard was made to
'run' fully 80486DX-compatible with only the 80487SX
installed. The 80486SX was not installed, its function in the
combination was fulfilled by a number of connections and
resistors :-)[ Reply to This | Parent | # ]
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